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My 2002 Cadilac Escalade overheats when parked for a while with the AC on. on 2002 Cadillac Escalade

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Sometimes when i even stop at a red light the temp starts going up. When i start moving the temp goes down. what could be the problem?
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Ok but is it working like it should? That is the only thing to cool the engine when stopped. Ram air at road speed does the cooling. Only other possible cause is the water pump but not likely.
Probably condenser fan, if not have your radiator checked....water pump would be last resort...doesn't sound like a thermostat.